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Ice and Permafrost
4
ROSS SEA
4
Snow
4
*LAND ICE
2
ANTARCTIC REGIONS
2
ICE
2
LAND ICE
2
Terminal Flight Facilities
2
*ANTARCTIC REGIONS
1
*BIOLOGICAL CONTAMINATION
1
*ELECTRON PRECIPITATION
1
*ENVIRONMENTAL IMPACT
1
*GLACIERS
1
*ICE
1
*Ice shelves
1
*LANDING FIELDS
1
*POLAR CAP
1
*POLAR REGIONS
1
*RADAR EQUIPMENT
1
*RUNWAYS
1
*SEWAGE DISPOSAL
1
*SOLID WASTES
1
ABLATION
1
ANTENNAS
1
Active & Passive Radar Detection & Equipment
1
Atmospheric Physics
1
BOUNDARIES
1
BRINES
1
BURIED OBJECTS
1
COLD REGIONS
1
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